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(C) The $9:3:3:1$ ratio is the classic Mendelian dihybrid phenotypic ratio. When the phenotypic ratio in a dihybrid cross shifts to $1:4:6:4:1$,it ind

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Polygenic inheritance

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(C) The $9:3:3:1$ ratio is the classic Mendelian dihybrid phenotypic ratio. When the phenotypic ratio in a dihybrid cross shifts to $1:4:6:4:1$,it indicates that the trait is controlled by multiple genes,each having an additive effect on the phenotype. This specific ratio $(1:4:6:4:1)$ is characteristic of polygenic inheritance involving two gene pairs,often observed in traits like human skin color or kernel color in wheat. Therefore,it is an example of polygenic inheritance.

In a dihybrid cross,instead of a $9:3:3:1$ ratio,a $1:4:6:4:1$ ratio is obtained. This is an example of .....

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